Chromenopyrazole-based TADF emitters for bluish-green and sky-blue OLEDs

Chromenopyrazole-based TADF emitters for bluish-green and sky-blue OLEDs Full article

Journal

Journal of Materials Chemistry C
ISSN: 2050-7526 , E-ISSN: 2050-7534

Output data

Year: 2026, Volume: 30, Article number : d6tc01133k, Pages count : DOI: 10.1039/d6tc01133k

Authors

Korshunov Vladislav M. ^1,2 , Chmovzh Timofey N. ³ , Tsorieva Alisia V. ² , Zhukov Ivan A. ^4,3,5 , Lypenko Dmitry A. ⁶ , Nasyrova Darina I. ³ , Dmitriev Artem V. ⁶ , Ivanov Ivan V. ⁴ , Traven Valery F. ^4,5 , Taydakov Ilya V. ² , Rakitin Oleg A. ³

Affiliations

1	Bauman Moscow State Technical University, 5/1 2-ya Baumanskaya Str., 105005, Moscow, Russia
2	P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 53 Leninskiy 1. Prospect, 119991, Moscow, Russia
3	N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky prospect, 47, Moscow, 119991, Russia
4	D. I. Mendeleev University of Chemical Technology, Miusskaya Ploshchad’, Building 1, 125047 9, Moscow, Russia
5	Skoltech Center for Energy Science and Technology, Skolkovo Institute of Science and Technology, 121205, Moscow, Russia
6	Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 31-4, Leninsky prospect, 119071, Moscow, Russia

Thermally activated delayed fluorescence (TADF) materials have emerged as efficient, sustainable alternatives to phosphorescent emitters in organic light-emitting diodes (OLEDs), as they do not require heavy metals which are expensive and damaging to the environment. Nevertheless, the development of bright and high-efficiency bluish-green TADF emitters remains a significant challenge. Herein, we present a series of novel molecules based on a chromenopyrazole (CP) acceptor with various donor moieties, phenoxazine, phenothiazine, and phenoselenazine, demonstrating TADF emission. TADF has been confirmed by luminescence spectroscopy methods and quantum chemical TD-DFT calculations. Among the investigated dyes, phenoxazine-containing dye (POZCP) has demonstrated the most favorable photophysical characteristics for OLED applications, including a delayed fluorescence lifetime of 1.8 ms in the doped PMMA film. An OLED device employing POZCP exhibited bluish-green emission with a maximum luminance of 13 864 cd m 2, a current efficiency of 11.6 cd A 1, a peak EQE of 14.6%, a T90 of 20 h and a low turn-on voltage of 3.0 V. Structural modification of POZCP by incorporating an additional phenyl ring as a p-spacer resulted in a broader electroluminescence spectrum with sky-blue emission; however, this significantly suppressed the TADF process. These findings establish CP-based molecules as promising candidates for efficient bluish-green and sky-blue TADF emitters and highlight their potential in next-generation OLED technologies.

Korshunov V.M. , Chmovzh T.N. , Tsorieva A.V. , Zhukov I.A. , Lypenko D.A. , Nasyrova D.I. , Dmitriev A.V. , Ivanov I.V. , Traven V.F. , Taydakov I.V. , Rakitin O.A.
Chromenopyrazole-based TADF emitters for bluish-green and sky-blue OLEDs
Journal of Materials Chemistry C. 2026. V.30. d6tc01133k . DOI: 10.1039/d6tc01133k WOS Scopus OpenAlex

Submitted:	Apr 9, 2026
Accepted:	Apr 25, 2026
Published online:	May 13, 2026

≡ Web of science:	WOS:001764507100001
≡ Scopus:	2-s2.0-105038628757
≡ OpenAlex:	W7156080053